Bending Mechanical Properties of Cement Concrete with Fiber Grid Reinforcement

In order to investigate the influence of fiber grid type, surface treatment and coarse aggregate limiting grain size on bending mechanical properties of cement concrete, fourteen group specimens with dimensions of 150 mm150 mm600 mm were tested through four-point bending experiments. The failure processes of the specimens were analyzed, the mechanical mechanism of the interaction between fiber grid and cement concrete was discussed, and some suggestions about the use of fiber grid were proposed. The research result shows that brittle failure characterizes the damage of the specimens. Fiber grid greatly improves the bending mechanical properties of cement concrete, and the bending strength of cement concrete is improved by 6.62% to 31.40%. When coarse aggregate limiting grain size is 20 mm compared with 40 mm, the bending strength of cement concrete increases by 2.72% to 9.97%. The bending strength of cement concrete is improved by 8.30% to 11.88% when fiber grid surface is treated with epoxy resin.